四年级下册简便运算集锦Word文档格式.docx
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(13X5)480÷
(8X2)
=64÷
8÷
2
=8÷
=4
第十三种625÷
25360÷
24270÷
45
55÷
=625÷
5=125÷
=25
243+85-243+85423+76-76+7725+75-25+75第十四种100+45-100+45
=()+(45+45100-100)=0+90
=90
12X6÷
12X656X856X8÷
第十五种20X4÷
20X425X425X4÷
))X(4X4(=20÷
20=1X16
=16
347+125)练习:
169+354+231+1461347-(987-362-138
148X56-48X56135+236-135+236198X26
15210÷
215X63-15X63199X37+37
125X33X4203X14101X22-22
452-398
365+997125X16X50
简便运算习题
1.加法交换律(a+b=b+a)
如:
152+389+348
=152+348+399
=500+399
=899
习题:
77+56+23165+477+135154+288+46
2.加法结合律a+b+c=a+(b+c)
591+482+118
=591+(482+118)
=591+600
=1191
285+147+25399+178+122456+588+412692+325+75
3.加法交换律、结合律41
32+29+68+如:
=32+68+29+41加法交换律
加法结合律29+41)=(32+68)+(=100+70
=170
128+114+86+172650+(171+350)+129习题:
(148+64)+(52+136)
a×
a×
b=b4.乘法交换律45×
4如:
25×
×
45=25×
445=100×
=4500
40×
692583125×
×
4125×
27×
c)
(b×
乘法结合律:
5.a×
b×
c=a×
32
125×
如:
78×
125×
8
84)8=78×
(125×
)=125×
(4×
=781000=125×
8×
=4000
=78000
125×
721258842552习题:
12548
44×
2532×
25
6.乘法交换律、结合律
4×
=125×
25乘法交换律
=(125×
8)×
(4×
25)乘法结合律
=1000×
100
7.乘法分配律:
(b+c)=a×
b+a×
c
57+27×
4327×
99+2727×
99
=27×
(57+43)=27×
(99+1)=27×
(100-1)
100=27×
100-27×
1
=2700=2700=2673
67×
34+67×
66127×
43-27×
101-27
27×
10167×
21+67×
78+6767×
23+67×
78+67-67
12×
340+66×
12025×
44125×
88
85×
10269×
10278×
98
65+65×
995×
87+87+87×
4
8.减法运算性质;
a-b-c=a-(b+c)=a-c-b
781-178-122721-488-121745-(245+188)
=781-(178+122)=721-121-488=745-245-188
=781-300=600-488=500-188
=481=112=312
456-273-127623-169-223553-(289+153)
772-456+228689-(289-153)136-88+164-112
9.除法运算性质;
a÷
b÷
c=a÷
c)=a÷
c÷
b
720÷
36÷
2
=720÷
(36×
2)
=720÷
72
=10
2700÷
45600÷
563900÷
(39×
4)
综合练习简便运算
怎样简便就怎样算。
一、355+260+140+24598×
10148×
125645-180-245
38×
99+383500÷
14÷
5175×
56+25×
5650×
20×
40
二、368+156+344+132125×
47×
87200÷
444×
482-(182+5063×
96×
58+96×
426300÷
(5))135×
27+135×
72+135
44×
2525÷
7200÷
48368+156+344+132三、125×
27+135×
72+135135×
182+50482-()5(58+96×
96×
63×
)
3700÷
4÷
2598×
29+132四、789-136-64132×
83+166
48×
12532×
125125088×
15-10888+36×
36×
645-180-24512548×
10198×
355+260+140+245五、.
56125×
32×
六、98+265+202273-73-27250×
13×
43200÷
4÷
88×
12599×
38+3817×
23-23×
772×
125
1655-3452182-25×
(12×
40)99×
56+56七、64×
15-5×
64
(40+8)×
2597×
1253200÷
25298×
99+298
645-180-245八、355+260+140+245102×
992×
12532×
35×
8+356-4×
35860×
382101-3824×
50×
56九、25×
46101×
-1022-47826×
42299
+6436672--135287987-(+)478256144-+366464+-36
--500-139--487十、28761257-368-2000-34143132422-378-1814
89×
99+89155+264+36+4425×
(20+4)88×
225+225×
12
十一、698-291-9568-(68+178)561-19+58382+165+35-82
236+189+64759-126-25925×
79×
4569-256-44
十二、216+89+1157×
81050÷
15÷
7169×
123—23×
169
37×
99+37129×
101—129149×
69—149+149×
3256×
51+56×
48+56
十三、125×
3224×
25125×
48514+189—214
369—256+15656×
12524×
73+26×
24109+(291—176)
十四、16×
98+32512+(373—212)228+(72+189)169+199
586×
99575—250—27537×
21—21×
12—21125×
三、计算(能简便就简便)
一、85+14×
(14+208÷
26)21+(327-23)÷
19539-513÷
(378÷
14)
34-3094÷
17÷
1319+(253-22)÷
2150+20×
28-42
(23+23)×
24-597(110-10)÷
10-1045-24+14×
14
120÷
(70+10)÷
(18-10)二、304-275÷
(275÷
25)12×
18-54
(10-100÷
10)×
1115-3244+16×
21)×
(53-588÷
36
17+(233-43)÷
10(17-10)(60+10)÷
10-60100÷
10×
22+(374-10)÷
19×
三、424-475÷
1626(245-11)÷
18-11
17-10(252-14)÷
10)22-(10+100÷
1535-13+10×
16-12(346-10)÷
3321)×
(45-651÷
11)(121÷
215-198÷
四、19+192÷
12-10572÷
22×
23-15819+56-1224÷
34
(714-12)÷
27-1914+(21-19)×
1418-(13+15)÷
262
736÷
(43-20)×
23(227+11)÷
(31-14)36+19×
14-23
12(31-154÷
11)×
五、828÷
23×
12-4818-15+10×
18
357÷
21×
13-213160÷
(1369-37)÷
37-32(22-12)×
22
(20+18)×
11-239(438-39)÷
21-1235985-728÷
26×
58+370)÷
(64-45)120-144÷
18+35(40+六、50160÷
(16+85×
3856÷
1612-5078×
1440÷
4000÷
16+832÷
13)
(228-)×
28)37)25326+95×
(÷
÷
2575(4275-24×
187236÷
)119+31×
(812-700÷
6+425×
七、178-145÷
2821÷
420+580-64×
50+160÷
40=54120-144÷
18+35=147(58+37)÷
(64-9×
5)
95÷
(64-45)178-145÷
5×
6+42120-36×
18+35
八、58×
58+58×
423874-(874+1000)136×
101-136
329-38-62347-129-1474600÷
45360×
12532÷
6000÷
125÷
825×
I26118九、44×
25591+482+99×
473+79-6315125×
8986+1999
76+38+24+16280×
501-8099+199199×
4525+2555×
8412525十、×
409258
32+129+268+71×
5555+45×
55438+126+162+674
26-56
37-56×
5665×
135+8×
85×
6×
8.
十一、45×
12+55×
1242×
9+58×
955×
45+45×
18×
27+18×
2358×
137-58×
3778×
8-28×
7×
69+7×
2136×
27+27×
6499×
64+64
45202十二、250×
36×
250
50125×
32301×
30199
25×
(8+40)49×
49+4945×
201-45
7×
43250×
12568十三、×
250
9931×
959+9125138×
99+99
199+99×
99401-35101-3939×
35
32×
十四、25165-35-65125×
)4÷
4+16×
(15
94+38+106+62125×
15×
8125×
48989-186-14
十五、4600÷
4136×
101-13632×
37+47×
37+21×
37
6878×
37-99×
77+7799×
7+7+3×
(12599+125)×
165×
999+5+99×
9+3+9
99102十六、355+260+140+245×
645-180-245
4101-382×
38260835
6-4×
8+35×